<template>
    <el-upload
      class="avatar-uploader"
      action=""
      :show-file-list="false"
      :before-upload="beforeAvatarUpload"
    >
      <!-- (自动上传)action是上传地址 人资项目不需要 人资项目(手动上传)  -->
      <!-- show-file-list不展示列表 -->
      <img v-if="value" :src="value" class="avatar">
      <i v-else class="el-icon-plus avatar-uploader-icon" />
    </el-upload>
  </template>
  
  <script>
  export default {
    props: {
      value: {
        type: String,
        default: ''
      }
    },
    methods: {
      // 检查函数 判断文件的类型还有大小 return  true(继续上传)/false(停止上传)
      beforeAvatarUpload(file) {
        // jpeg png gif bmp
  
        const isJPG = ['image/jpeg', 'image/png', 'image/gif', 'image/bmp'].includes(file.type)
        const isLt2M = file.size / 1024 / 1024 < 5 // 5M
  
        if (!isJPG) {
          this.$message.error('上传头像图片只能是 JPG PNG GIF BMP 格式!')
        }
        if (!isLt2M) {
          this.$message.error('上传头像图片大小不能超过 5MB!')
        }
        return isJPG && isLt2M
      }
    }
  }
  </script>
  
  <style>
    .avatar-uploader .el-upload {
      border: 1px dashed #d9d9d9;
      border-radius: 6px;
      cursor: pointer;
      position: relative;
      overflow: hidden;
    }
    .avatar-uploader .el-upload:hover {
      border-color: #409EFF;
    }
    .avatar-uploader-icon {
      font-size: 28px;
      color: #8c939d;
      width: 178px;
      height: 178px;
      line-height: 178px;
      text-align: center;
    }
    .avatar {
      width: 178px;
      height: 178px;
      display: block;
    }
  </style>